Karen, it's a diaphragm carb. It has two screws on the side, one for air mixture ratio and the other for fuel.. ?
Initally, I put both of them in all the way and backed each out 1.5 turns. I have the idle setting at just a hair above flat, and was going to adjust that once the engine was warm and had been running a while, but can't get it to start now :shrug: